Wilhelm Heinrich Walter Baade (March 24, 1893 - June 25, 1960) was a German astronomer who emigrated to the USA in 1931. An asteroid is a small, solid object in our Solar System, orbiting the Sun. ... March 10 is the 69th day of the year in the Gregorian Calendar (70th in Leap years). ... 1920 is a leap year starting on Thursday (link will take you to calendar) // Events January January 7 - Forces of Russian White admiral Kolchak surrender in Krasnoyarsk. ... August 15 is the 227th day of the year in the Gregorian Calendar (228th in leap years), with 138 days remaining. ... 1920 is a leap year starting on Thursday (link will take you to calendar) // Events January January 7 - Forces of Russian White admiral Kolchak surrender in Krasnoyarsk. ... 944 Hidalgo is an unusual asteroid, and has the longest orbital period (13. ... October 31 is the 304th day of the year (305th in leap years) in the Gregorian Calendar, with 61 days remaining, as the final day of October. ... 1920 is a leap year starting on Thursday (link will take you to calendar) // Events January January 7 - Forces of Russian White admiral Kolchak surrender in Krasnoyarsk. ... November 9 is the 313th day of the year (314th in leap years) in the Gregorian Calendar, with 52 days remaining. ... 1921 was a common year starting on Saturday (see link for calendar). ... November 9 is the 313th day of the year (314th in leap years) in the Gregorian Calendar, with 52 days remaining. ... 1921 was a common year starting on Saturday (see link for calendar). ... 1036 Ganymed is the largest Amor asteroid. ... October 23 is the 296th day of the year (297th in leap years) in the Gregorian Calendar, with 69 days remaining. ... 1924 was a leap year starting on Tuesday (link will take you to calendar). ... November 9 is the 313th day of the year (314th in leap years) in the Gregorian Calendar, with 52 days remaining. ... 1928 was a leap year starting on Sunday (link will take you to calendar). ... 1566 Icarus is an Apollo asteroid (a sub-class of near-Earth asteroid) whose unusual characteristic is that at perihelion it is closer to the Sun than Mercury; it is said to be a Mercury-crosser asteroid. ... June 27 is the 178th day of the year (179th in leap years) in the Gregorian calendar, with 187 days remaining. ... 1949 is a common year starting on Saturday. ... October 8 is the 281st day of the year (282nd in leap years). ... 1920 is a leap year starting on Thursday (link will take you to calendar) // Events January January 7 - Forces of Russian White admiral Kolchak surrender in Krasnoyarsk. ... January 14 is the 14th day of the year in the Gregorian calendar. ... 1948 is a leap year starting on Thursday (link will take you to calendar). ... March 24 is the 83rd day of the year in the Gregorian Calendar (84th in Leap years). ... 1893 was a common year starting on Sunday (see link for calendar). ... June 25 is the 176th day of the year (177th in leap years) in the Gregorian Calendar, with 189 days remaining. ... 1960 was a leap year starting on Friday (link will take you to calendar). ... An astronomer or spmething i cant inderstand is a scientist whose area of research is astronomy or astrophysics. ... 1931 is a common year starting on Thursday. ...

Biography

Along with Fritz Zwicky, he proposed that supernovae could create neutron stars. Life and work Fritz Zwicky (February 14, 1898 – February 8, 1974) was a Swiss--American astronomer. ... Remnant of Keplers Supernova, SN 1604. ... Cross section of a neutron star A neutron star is a type of degenerate star composed mostly of densely packed neutrons, generally about 20 km in diameter and as massive as an average star. ...

He took advantage of wartime blackout conditions during World War II, which reduced light pollution at Mount Wilson Observatory, to resolve stars in the center of the Andromeda galaxy for the first time, which led him to define distinct "populations" for stars (Population I and Population II). World War II was a truly global conflict with many facets: immense human suffering, fierce indoctrinations, and the use of new, extremely devastating weapons like the atom bomb. ... Light pollution (also known as photopollution, luminous pollution) is excess or obtrusive light created by humans. ... The Mount Wilson Observatory (MWO) is an astronomical observatory in Los Angeles County, California. ... This image is a Galaxy Evolution Explorer observation of the large galaxy in Andromeda, Messier 31. ...

He discovered that there are two types of Cepheid variable stars, and identified the Crab Nebula as the remnant of the supernova of the year 1054, and identified the optical counterparts of various radio sources. A Cepheid variable is a member of a particular class of variable stars, notable for a fairly tight correlation between their period of variability and absolute stellar luminosity. ... Messier Object 1, the Crab Nebula. ... Events Cardinal Humbertus, a representative of Pope Leo IX, and Michael Cerularius, Patriarch of Constantinople, decree each others excommunication. ...

He discovered 10 asteroids, including notably 944 Hidalgo (long orbital period) and the Apollo-class asteroid 1566 Icarus (whose perihelion is closer than that of Mercury) and the Amor asteroid 1036 Ganymed. An asteroid is a small, solid object in our Solar System, orbiting the Sun. ... 944 Hidalgo is an unusual asteroid, and has the longest orbital period (13. ... The Apollo asteroids are a group of near-Earth asteroids named after 1862 Apollo, the first asteroid of this group to be discovered. ... 1566 Icarus is an Apollo asteroid (a sub-class of near-Earth asteroid) whose unusual characteristic is that at perihelion it is closer to the Sun than Mercury; it is said to be a Mercury-crosser asteroid. ... Atmospheric characteristics Atmospheric pressure trace Potassium 31. ... The Amor asteroids are a group of near-Earth asteroids named after the asteroid 1221 Amor. ... 1036 Ganymed is the largest Amor asteroid. ...

Honors

Awards

• Gold Medal of the Royal Astronomical Society (1954)
• Bruce Medal (1955)
• Henry Norris Russell Lectureship of the American Astronomical Society (1958)

Named after him The Gold Medal is the highest award of the Royal Astronomical Society. ... 1954 was a common year starting on Friday of the Gregorian calendar. ... The Catherine Wolfe Bruce gold medal is awarded every year by the Astronomical Society of the Pacific for outstanding lifetime contributions to astronomy. ... 1955 is a common year starting on Saturday of the Gregorian calendar. ... The Henry Norris Russell Lectureship is awarded each year by the American Astronomical Society in recognition of a lifetime of excellence in astronomical research. ... The American Astronomical Society (AAS) is a US society of professional astronomers and other interested individuals, headquartered in Washington, DC. The main aim of the AAS is provide a political voice for its members and organise their lobbying. ... 1958 was a common year starting on Wednesday of the Gregorian calendar. ...

• Asteroid 1501 Baade
• Baade crater on the Moon
• A vallis (valley) on the Moon
• One of the two Magellan telescopes
• Baade's Window, an area relatively free of dust near the Galactic Center in Sagittarius

An asteroid is a small, solid object in our Solar System, orbiting the Sun. ... Baade is a lunar impact crater that is located near the southwest limb of the Moon on the near side, to the southwest of the enormous Mare Orientale impact basin. ... Crust composition Oxygen 43% Silicon 21% Aluminium 10% Calcium 9% Iron 9% Magnesium 5% Titanium 2% Nickel 0. ... Vallis (plural valles) is the Latin word for valley. ... The Magellan Telescopes are 6. ... 50 cm refracting telescope at Nice Observatory. ... The Galactic Center is the rotational center of the Milky Way galaxy. ... Sagittarius (♐, and Latin for Archer) is a constellation of the zodiac, commonly depicted as a centaur drawing a bow. ...

Books

Walter Baade: A Life in Astrophysics, Donald E. Osterbrock, ISBN 0-691-04936-X Donald Edward Osterbrock (born July 13, 1924) is an American astronomer. ...

External links

• Bruce Medal page
• Awarding of Bruce Medal
• Awarding of RAS gold medal

Obituaries

• AN 285 (1960) 286 (one sentence, in German)
• JRASC 55 (1961) 113
• MitAG 14 (1961) 5
• Obs 80 (1960) 166 (one sentence)
• PASP 72 (1960) 434 (one paragraph)
• QJRAS 2 (1961) 118